The widely available Circuit Detective for identifying circuit breakers is notorious for having a hair-trigger on switch. I found the reputation well deserved.  I couldn't find anything online to fix the problem,  so I quickly threw together this device which serves as a switch guard. 

It intentionally fits quite snugly so it won't slip off in a tool box or carrying it around.  If you find it too tight (or loose), just scale it slightly in X and Y only in the slicer.